OK.
First time playing the campaign and playing the short Julii campaign on medium. Have fought the Spanish twice now in medium size battles (~1000) per side, and am getting thrashed. I had no problem with Gauls and with Spanish until recently. Either they wrap around both flanks with Cav or they blow right through my center, usually led by Heavy Cav.

My lines are predominantly Hastati with some Princeps. Do I need to be using Triari at this point? Any tips would be appreciated.

Thanks.